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采用凍結法開鑿立井井筒期間,應定期測定站內空氣中的氨氣濃度,氨氣濃度不得大于()。 (單選題) ?

作者:煤礦安全網 2022-05-27 09:15 來源:煤礦安全網 凍結法 立井井筒 空氣 氨氣 濃度 單選題
題目信息:

  采用凍結法開鑿立井井筒期間,應定期測定站內空氣中的氨氣濃度,氨氣濃度不得大于()。 (單選題)

  A.0.004%

  B.0.002%

  C.0.001%

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